gh-95855: Refactor platform triplet detection code, add detection for MIPS soft float and musl libc (#107221)

- Move platform triplet detection code into Misc/platform_triplet.c
- Refactor MIPS detection, use defined(__mips64) to detect MIPS64
- Compute libc values in separate section
- Add detection for MIPS soft float
- Add detection for musl

musl supports SPE with its soft-float ABI:
https://git.musl-libc.org/cgit/musl/commit/?id=7be59733d71ada3a32a98622507399253f1d5e48

Original patch by Christian Heimes.

Co-authored-by: Christian Heimes <christian@python.org>
Co-authored-by: Erlend E. Aasland <erlend@python.org>

1 files changed, 4 insertions, 188 deletions

diff --git a/configure b/configure
index f78b45a..34e874c 100755
--- a/configure
+++ b/configure
@@ -6719,200 +6719,16 @@ fi
 
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for the platform triplet based on compiler characteristics" >&5
 printf %s "checking for the platform triplet based on compiler characteristics... " >&6; }
-cat > conftest.c <<EOF
-#undef bfin
-#undef cris
-#undef fr30
-#undef linux
-#undef hppa
-#undef hpux
-#undef i386
-#undef mips
-#undef powerpc
-#undef sparc
-#undef unix
-#if defined(__ANDROID__)
-    # Android is not a multiarch system.
-#elif defined(__linux__)
-# if defined(__x86_64__) && defined(__LP64__)
-        x86_64-linux-gnu
-# elif defined(__x86_64__) && defined(__ILP32__)
-        x86_64-linux-gnux32
-# elif defined(__i386__)
-        i386-linux-gnu
-# elif defined(__aarch64__) && defined(__AARCH64EL__)
-#  if defined(__ILP32__)
-        aarch64_ilp32-linux-gnu
-#  else
-        aarch64-linux-gnu
-#  endif
-# elif defined(__aarch64__) && defined(__AARCH64EB__)
-#  if defined(__ILP32__)
-        aarch64_be_ilp32-linux-gnu
-#  else
-        aarch64_be-linux-gnu
-#  endif
-# elif defined(__alpha__)
-        alpha-linux-gnu
-# elif defined(__ARM_EABI__) && defined(__ARM_PCS_VFP)
-#  if defined(__ARMEL__)
-        arm-linux-gnueabihf
-#  else
-        armeb-linux-gnueabihf
-#  endif
-# elif defined(__ARM_EABI__) && !defined(__ARM_PCS_VFP)
-#  if defined(__ARMEL__)
-        arm-linux-gnueabi
-#  else
-        armeb-linux-gnueabi
-#  endif
-# elif defined(__hppa__)
-        hppa-linux-gnu
-# elif defined(__ia64__)
-        ia64-linux-gnu
-# elif defined(__loongarch__)
-#  if defined(__loongarch_lp64)
-#   if defined(__loongarch_soft_float)
-        loongarch64-linux-gnusf
-#   elif defined(__loongarch_single_float)
-        loongarch64-linux-gnuf32
-#   elif defined(__loongarch_double_float)
-        loongarch64-linux-gnu
-#   else
-#    error unknown platform triplet
-#   endif
-#  else
-#   error unknown platform triplet
-#  endif
-# elif defined(__m68k__) && !defined(__mcoldfire__)
-        m68k-linux-gnu
-# elif defined(__mips_hard_float) && defined(__mips_isa_rev) && (__mips_isa_rev >=6) && defined(_MIPSEL)
-#  if _MIPS_SIM == _ABIO32
-        mipsisa32r6el-linux-gnu
-#  elif _MIPS_SIM == _ABIN32
-        mipsisa64r6el-linux-gnuabin32
-#  elif _MIPS_SIM == _ABI64
-        mipsisa64r6el-linux-gnuabi64
-#  else
-#   error unknown platform triplet
-#  endif
-# elif defined(__mips_hard_float) && defined(__mips_isa_rev) && (__mips_isa_rev >=6)
-#  if _MIPS_SIM == _ABIO32
-        mipsisa32r6-linux-gnu
-#  elif _MIPS_SIM == _ABIN32
-        mipsisa64r6-linux-gnuabin32
-#  elif _MIPS_SIM == _ABI64
-        mipsisa64r6-linux-gnuabi64
-#  else
-#   error unknown platform triplet
-#  endif
-# elif defined(__mips_hard_float) && defined(_MIPSEL)
-#  if _MIPS_SIM == _ABIO32
-        mipsel-linux-gnu
-#  elif _MIPS_SIM == _ABIN32
-        mips64el-linux-gnuabin32
-#  elif _MIPS_SIM == _ABI64
-        mips64el-linux-gnuabi64
-#  else
-#   error unknown platform triplet
-#  endif
-# elif defined(__mips_hard_float)
-#  if _MIPS_SIM == _ABIO32
-        mips-linux-gnu
-#  elif _MIPS_SIM == _ABIN32
-        mips64-linux-gnuabin32
-#  elif _MIPS_SIM == _ABI64
-        mips64-linux-gnuabi64
-#  else
-#   error unknown platform triplet
-#  endif
-# elif defined(__or1k__)
-        or1k-linux-gnu
-# elif defined(__powerpc__) && defined(__SPE__)
-        powerpc-linux-gnuspe
-# elif defined(__powerpc64__)
-#  if defined(__LITTLE_ENDIAN__)
-        powerpc64le-linux-gnu
-#  else
-        powerpc64-linux-gnu
-#  endif
-# elif defined(__powerpc__)
-        powerpc-linux-gnu
-# elif defined(__s390x__)
-        s390x-linux-gnu
-# elif defined(__s390__)
-        s390-linux-gnu
-# elif defined(__sh__) && defined(__LITTLE_ENDIAN__)
-        sh4-linux-gnu
-# elif defined(__sparc__) && defined(__arch64__)
-        sparc64-linux-gnu
-# elif defined(__sparc__)
-        sparc-linux-gnu
-# elif defined(__riscv)
-#  if __riscv_xlen == 32
-        riscv32-linux-gnu
-#  elif __riscv_xlen == 64
-        riscv64-linux-gnu
-#  else
-#   error unknown platform triplet
-#  endif
-# else
-#   error unknown platform triplet
-# endif
-#elif defined(__FreeBSD_kernel__)
-# if defined(__LP64__)
-        x86_64-kfreebsd-gnu
-# elif defined(__i386__)
-        i386-kfreebsd-gnu
-# else
-#   error unknown platform triplet
-# endif
-#elif defined(__gnu_hurd__)
-        i386-gnu
-#elif defined(__APPLE__)
-        darwin
-#elif defined(__VXWORKS__)
-        vxworks
-#elif defined(__wasm32__)
-#  if defined(__EMSCRIPTEN__)
-	wasm32-emscripten
-#  elif defined(__wasi__)
-#    if defined(_REENTRANT)
-	wasm32-wasi-threads
-#    else
-	wasm32-wasi
-#    endif
-#  else
-#    error unknown wasm32 platform
-#  endif
-#elif defined(__wasm64__)
-#  if defined(__EMSCRIPTEN__)
-	wasm64-emscripten
-#  elif defined(__wasi__)
-	wasm64-wasi
-#  else
-#    error unknown wasm64 platform
-#  endif
-#else
-# error unknown platform triplet
-#endif
-
-EOF
-
-if $CPP $CPPFLAGS conftest.c >conftest.out 2>/dev/null; then
-  PLATFORM_TRIPLET=`grep -v '^#' conftest.out | grep -v '^ *$' | tr -d ' 	'`
-  case "$build_os" in
-  linux-musl*)
-    PLATFORM_TRIPLET=`echo "$PLATFORM_TRIPLET" | sed 's/linux-gnu/linux-musl/'`
-    ;;
-  esac
+if $CPP $CPPFLAGS $srcdir/Misc/platform_triplet.c >conftest.out 2>/dev/null; then
+  PLATFORM_TRIPLET=`grep '^PLATFORM_TRIPLET=' conftest.out | tr -d ' 	'`
+  PLATFORM_TRIPLET="${PLATFORM_TRIPLET#PLATFORM_TRIPLET=}"
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $PLATFORM_TRIPLET" >&5
 printf "%s\n" "$PLATFORM_TRIPLET" >&6; }
 else
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: none" >&5
 printf "%s\n" "none" >&6; }
 fi
-rm -f conftest.c conftest.out
+rm -f conftest.out
 
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for multiarch" >&5
 printf %s "checking for multiarch... " >&6; }